Python 'NoneType' object is not subscriptable ， 获取到的数据为None，需要保留数据

爬取豆瓣电影数据的时候，在获取内容的时候出现 

'NoneType' object is not subscriptable      

获取数据的部分代码是：

writer_avatars = (writers_list[wi]['avatars']['small'])  # 编剧照片
        writer_name_en = (writers_list[wi]['name_en'].replace("\'", "\\\'")  # 编剧英文名
        writer_name = (writers_list[wi]['name'].replace("\'", "\\\'")  # 编剧名字
        writer_alt = (writers_list[wi]['alt'])  # 编剧在豆瓣中的个人主页url
        writer_id = writers_list[wi]['id']  # 编剧在豆瓣中个人id
        writer_id_list.append(int(writer_id))      

输出获取到的数据：

[
{'avatars': {'small': 'http://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p21289.jpg', 'large': 'http://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p21289.jpg', 'medium': 'http://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p21289.jpg'}, 
'name_en': 'Joe Ma', 
'name': '马伟豪', 
'alt': 'https://movie.douban.com/celebrity/1290574/', 
'id': '1290574'}, 
             
{'avatars': {'small': 'http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1455792638.81.jpg', 'large': 'http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1455792638.81.jpg', 'medium': 'http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1455792638.81.jpg'}, 
'name_en': 'Ivy Kong', 
'name': '江玉仪', 
'alt': 'https://movie.douban.com/celebrity/1275631/', 
'id': '1275631'}, 
             
{'avatars': {'small': 'http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1496898017.43.jpg', 'large': 'http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1496898017.43.jpg', 'medium': 'http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1496898017.43.jpg'}, 
'name_en': 'Sunny Chan', 
'name': '陈咏燊', 
'alt': 'https://movie.douban.com/celebrity/1375202/', 
'id': '1375202'}, 
             
{'avatars': {'small': 'http://img9.doubanio.com/view/celebrity/s_ratio_celebrity/public/p3555.jpg', 'large': 'http://img9.doubanio.com/view/celebrity/s_ratio_celebrity/public/p3555.jpg', 'medium': 'http://img9.doubanio.com/view/celebrity/s_ratio_celebrity/public/p3555.jpg'}, 
'name_en': 'Felix Chong', 
'name': '庄文强', 
'alt': 'https://movie.douban.com/celebrity/1014716/', 
'id': '1014716'}, 
             
{'avatars': None, 'name_en': '', 'name': '钟健强', 'alt': None, 'id': None}, 
{'avatars': None, 'name_en': '', 'name': '孙浩浩', 'alt': None, 'id': None}
]      

可以看到之所以报错是因为 数据有为 None 的，是因为 None 类型是不可编写的

解决如下：

①如果有为 None 的数据不需要保留的话那可以直接用try:pass except:pass 捕获异常，程序正常运行

②如果即使有为None的数据也需要保存的话可以加入判断：if  ** is None: pass  esle:pass

部分加入判断的代码如下：

if writers_list[wi]['avatars'] is None:
                        writer_avatars = '暂无数据'
                    else:
                        if writers_list[wi]['avatars']['small'] is None:
                            writer_avatars = '暂无数据'
                        else:
                            writer_avatars = (writers_list[wi]['avatars']['small'])  # 编剧照片